Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 109, Issue -, Pages 894-906Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2017.01.120
Keywords
Total hemispherical emissivity; Monte Carlo; Emittance; Geometric optics approximation
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Funding
- U.S. Department of Energy Nuclear Energy University Program (NEUP) [DE-NE0000743]
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Kirchoff's law and experimentally obtained data and/or theory (such as from Drude's model) for optical constants have been used in a modified geometric optics approximation (GOA) to obtain directional spectral emissivity. Then this spectral emissivity is used to obtain the total hemispherical emissivity by integration over direction and spectral range as weighted by the Planck distribution. The computations account for surface dependencies on temperature, composition, and roughness. The computed results for both the spectral directional and the total hemispherical emissivity are compared with the available data for platinum, stainless steel 304, and tungsten surfaces. (C) 2017 Elsevier Ltd. All rights reserved.
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